Reconstructions

PS
*šinn- - tooth (SED I No. 249)
PS
*šu/in(n)ār-, *šurān- - cat (SED II No. 206)
Since a chain of borrowings (Akk. > Arm. > Arb. > MSA) is not unlikely, the Common Semitic status of the present term is doubtful.
PS
*špl - to be low (Kogan 2015:586)

Cf. *šapū/il-

PS
*šapū/il- - legs (as lower parts of body) (SED I No. 271)

Obviously from Sem. *špl ‘to be low’; reconstruction of a separate Sem. root with an anatomic meaning is tentative since a possibility of an independent development ‘lower part’ > ‘thigh/leg/feet’ in each of the languages cannot be ruled out (note SED I No. 271).

PS
*šVpp- - kind of snake, worm, insect larvae (SED II No. 207)
Phonetically and semantically close forms with -b- are united into a separate root *šibb- ‘kind of snake, worm’, SED II No. 200.
PS
*šrḳ - to steal (Kogan 2015:237)
PS
*šry/šrw - ? (Kogan 2015:397)
PS
*šit- - buttocks (SED I No. 255; Kogan 2011: 218)
PS
*šṭr - to write (Kogan–Krebernik 2021a:392f.)

The history of this root and its meaning being equal in such geographically and genealogically remote idioms as Akkadian, Arabic and ESA, but virtually absent from Aramaic, is enigmatic. Cf. Kogan–Krebernik 2021a:392f. for the discussion.

PS
*šty - to drink (CDG 518)